android ping 테스트 하는 소스 runtime.exec("ping -c 1 android.com");

String rs = ""; 
        { 
            try { 
                rs = Network.ping(host); 
            } catch (IOException e) { 
                e.printStackTrace(); 
            } catch (InterruptedException e) { 
                e.printStackTrace(); 
            } 
        } 
        Log.d(TAG, "rs="+rs); 


    public static class Network { 

        private static final String TAG = "Network.java"; 

        public static String pingError = null; 

        /** 
        * Ping a host and return an int value of 0 or 1 or 2 0=success, 1=fail, 2=error 
        * <p> 
        * Does not work in Android emulator and also delay by '1' second if host not pingable 
        * In the Android emulator only ping to 127.0.0.1 works 
        * 
        * @param @String host in dotted IP address format 
        * @return 
        * @throws IOException 
        * @throws InterruptedException 
        */ 
        public static int pingHost(String host) throws IOException, InterruptedException { 
            Runtime runtime = Runtime.getRuntime(); 
            Process proc = runtime.exec("ping -c 1 " + host); 
            proc.waitFor(); 
            int exit = proc.exitValue(); 
            return exit; 
        } 

        public static String ping(String host) throws IOException, InterruptedException { 
            StringBuffer echo = new StringBuffer(); 
            Runtime runtime = Runtime.getRuntime(); 
            Log.v(TAG, "About to ping using runtime.exec"); 
            Process proc = runtime.exec("ping -c 1 " + host); 
            proc.waitFor(); 
            int exit = proc.exitValue(); 
            if (exit == 0) { 
                InputStreamReader reader = new InputStreamReader(proc.getInputStream()); 
                BufferedReader buffer = new BufferedReader(reader); 
                String line = ""; 
                while ((line = buffer.readLine()) != null) { 
                    echo.append(line + "\n"); 
                } 
                return getPingStats(echo.toString()); 
            } else if (exit == 1) { 
                pingError = "failed, exit = 1"; 
                return null; 
            } else { 
                pingError = "error, exit = 2"; 
                return null; 
            } 
        } 

        /** 
        * getPingStats interprets the text result of a Linux ping command 
        * <p> 
        * Set pingError on error and return null 
        * <p> 
        * http://en.wikipedia.org/wiki/Ping 
        * <p> 
        * PING 127.0.0.1 (127.0.0.1) 56(84) bytes of data. 
        * 64 bytes from 127.0.0.1: icmp_seq=1 ttl=64 time=0.251 ms 
        * 64 bytes from 127.0.0.1: icmp_seq=2 ttl=64 time=0.294 ms 
        * 64 bytes from 127.0.0.1: icmp_seq=3 ttl=64 time=0.295 ms 
        * 64 bytes from 127.0.0.1: icmp_seq=4 ttl=64 time=0.300 ms 
        * <p> 
        * --- 127.0.0.1 ping statistics --- 
        * 4 packets transmitted, 4 received, 0% packet loss, time 0ms 
        * rtt min/avg/max/mdev = 0.251/0.285/0.300/0.019 ms 
        * <p> 
        * PING 192.168.0.2 (192.168.0.2) 56(84) bytes of data. 
        * <p> 
        * --- 192.168.0.2 ping statistics --- 
        * 1 packets transmitted, 0 received, 100% packet loss, time 0ms 
        * <p> 
        * # ping 321321. 
        * ping: unknown host 321321. 
        * <p> 
        * 1. Check if output contains 0% packet loss : Branch to success -> Get stats 
        * 2. Check if output contains 100% packet loss : Branch to fail -> No stats 
        * 3. Check if output contains 25% packet loss : Branch to partial success -> Get stats 
        * 4. Check if output contains "unknown host" 
        * 
        * @param s 
        */ 
        public static String getPingStats(String s) { 
            if (s.contains("0% packet loss")) { 
                int start = s.indexOf("/mdev = "); 
                int end = s.indexOf(" ms\n", start); 
                s = s.substring(start + 8, end); 
                String stats[] = s.split("/"); 
                return stats[2]; 
            } else if (s.contains("100% packet loss")) { 
                pingError = "100% packet loss"; 
                return null; 
            } else if (s.contains("% packet loss")) { 
                pingError = "partial packet loss"; 
                return null; 
            } else if (s.contains("unknown host")) { 
                pingError = "unknown host"; 
                return null; 
            } else { 
                pingError = "unknown error in getPingStats"; 
                return null; 
            } 
        } 
    }